Pac stood up to Arum in order to fight shot DLH, why is he unwilling to stand up now?

It's a shame that he'd rather hide behind Arum in order to avoid Mayweather, when it's clear that he has the ability to call the shots: "When the De La Hoya fight became possible, I had a big meeting -- I'll never forget it -- with Pacquiao in the suite at the Mandalay ," said Arum. "And I said: 'Manny, do you know what you're doing here? De La Hoya's so much bigger, so much stronger, you're liable to get hurt. There's a lot easier guys to fight. I'm telling you all of this because I want you to realize that maybe you shouldn't fight him.' And he got angry, and he said, 'I want to fight De La Hoya. I know I can beat him.' He looked at me with those steely eyes, and he really was sincere. It wasn't a question of the money or anything else. That's when I knew we had a helluva shot, and Freddie , who had trained Oscar, told us that Manny was going to beat Oscar. So we knew it internally, although Bruce , who knows fights, was leaning toward De La Hoya." http://espn.go.com/blog/boxing/post/_/id/708/arum-talks-pacquiao-past-future